Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Long-term Debt
Debt	$ 2,477,578	$ 2,732,074
Less current maturities of long-term debt	(82,594)	(81,497)
Less discount on senior secured credit facility term loan B	(1,378)	(1,504)
Long-term debt, net of current maturities	2,393,606	2,649,073
Senior secured credit facility
Long-term Debt
Debt	2,139,300	2,394,963
$325 million 8 3/4% senior subordinated notes due August 2019
Long-term Debt
Debt	325,000	325,000
Debt instrument interest rate stated percentage	8.75%
Other long-term obligations
Long-term Debt
Debt	11,217	10,000
Capital leases
Long-term Debt
Debt	$ 2,061	$ 2,111